Reamer.



UNITED STATES PATENT OEEICE.

LEwIs o. -STIL'LMAN, oF ooUDERsPoR'r, PENNSYLVANIA.

REAMER.

SPECIFICATION forming part of Letters Patent No. 651,730, dated June' 12, 1900.1

V Application tiled September 23, 1899. Serial No. 731.431. (No model.)

T0 all whom. it may concern:

Be it known that I, LEWIS C. STILLMAN, a citizen of the United States, residing at Coudersport, in the county of Potter and State of Pennsylvania, have invented a new and useful Reamer, of which the following is a specification.

This invention relates to reamers in4 general, and more particularly to that class employed in welt-drilling to ream out the hole made by the drill to an extent suflicient to permit the ready passage of the casing, one object of the invention being to provide a construction which will be simple and eiicient and in which the blades will be held yieldably in their operative positions and will be positively held against excessive outward movement.

A further object of the invention is to so construct the blades that they will have a maximum strength at the cutting edges to thus most effectively resist wear.

In the drawings, forming a port-ion of this specification, and in which similar numerals of reference designate corresponding and like parts in the several views, Figure l is a View showing the reamer in elevation and a portion of the casing in section. Fig. 2 is a vertical central section of l. Fig. 3 is a section on line 3 3 of Fig. 2.

Referring now to the drawings, 5 represents a substantially-cylindrical body portion comprising an upper and a lower part suitably connected. The upper and lower ends of the body are adapted to receive the drill-rod and drill, respectively, andare of the usual construction for this purpose. Transversely of the lower portion of the body is formed a passage 10, the lower wall of which is recessed, as shown in Fig. 2, and through which opens the central cylindrical bore 11 of the body, leading to the bit-socket 12. The outer surface of the body,`adjacent to the passage 10, is sloped inwardly, as shown at 13, and is cut away transversely, as shown at 13a, and in the passage 10 are pivoted two cutting-blades 14 and 15, having notches 16 and 17 in their free ends, and which notches are adapted to receive the outer edges of the bottom of the passage 10, the outer side of each recess 16 and 17 lying against the sloped portions 13 of the body when the blades are folded inwardly to lie ,iiushwith the outer surface of the body, while the inner faces of the recesses 16 and 17 are adapted to abut against the sides of the recessed lower wall or bottom of the passage 10 when the blades are moved outwardly to their limit. As shown in the drawings, the blade consists of the cutting portion 6, arc-shaped in cross-section to conform to the curvature of the body 5, and extending rearwardly from the cutting portion is a narrowed stem 30, which enters and fits the adjacent end of the passage 10. With this construction the blades may be folded inwardly to pass with the body downwardly and through the casing, at which timel the inner surfaces of the blades will lie against the portions 13 and 13 and the outer surfaces will lie iiush with the outer surfaces of the body 5, and the blades may then be moved on their pivots to project the cutting portions of such blades to the proper extent, when the greatest dimensions of the blades will be presented tothe cutting strain.

In order to hold the blades yieldably extended, they are provided in their adjacent edges with gear-teeth 17, with which engage the teeth upon the head 18 of a pin 19, passed upwardly through a perforation in the lower portion of the body and into a cylindrical chamber 21 in the upper portion of the body. At the lower end of the pin 19, lying in the chamber 2l, is fixed a collar 22, upon which is disposed one end of a helical spring 23, encircling the pin and pressing with its opposite end upon the upper end of the chamber 21. The tendency of this spring is to hold the pin'19 distended, while inward pressure upon the blades 14 and 15 will act to compress the spring and move the pin upwardly.

In operating this device the drill is applied and the reamer is connected with the drill-rod in the usual manner, the body of the reamer being flattened at 24 and 25 to permit the ap plication of a wrench. The blades 14 and 15 are then pressed inwardly and the reamer is inserted in the upper end of the casing and is forced downwardly therethrough until the blades pass from the lower end thereof. When the blades are passed out of the casing, they will be projected outwardly by the helical spring, and if the reamer be then rotated the IOO blades will act to cut avvay theearth and rock to enlarge the hole and permit the passage much more durable5aswil1 deistood.

What is claimed is=- In a reamer, the combination with a cylin` drical body portion having a transverse passage, the bottom of `which is recessed'to form edges at the ends of the passage, recesses in the body portion leading to these edges, and blades having broadened arc-shaped cutting portions and narrowed stems, the stems lying snugly within the passage and havingnotches to .receive said edges,V andthe cuttin'g por'- tions being'adapted to lie in the cut-away portions of the body and with their outer surfaces flush with the outer surfaces of the' rbody. This structure is" much stronger andV makes the implement be readily unl In testimony that I claim theff'oregoing as my own I have hereto aixed my signature in the presence of two witnesses.

LEWIS c. sTILLMAN..

Witnesses i SILAS STILLMAN, A 0; STILLMAN. 

